got the same issue
From what i've read, this seems to be an issue with the nightly versions of Luma.
If you can still access LumaUpdater try installing the normal Luma build from there.
I don't know how to help if you aren't able to access it, though. Sorry.
Edit:
You could try downloading the normal Luma payload from https://github.com/AuroraWright/Luma3DS/releases/tag/v6.3.1 and replacing the arm9loaderhax.bin on your SDs root with the one you downloaded.
That should have the same effect as updating through LumaUpdater.
Last edited by Ursus Major,